feat: 특정 선착순 이벤트에 참여한 특정 유저가 존재하는지 체크하는 JQPL 쿼리 작성

Server/src/main/java/JGS/CasperEvent/domain/event/repository/participantsRepository/RushParticipantsRepository.java

@@ -1,7 +1,15 @@
 package JGS.CasperEvent.domain.event.repository.participantsRepository;
 
+import JGS.CasperEvent.domain.event.entity.participants.RushParticipants;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
 import org.springframework.stereotype.Repository;
 
 @Repository
-public interface RushParticipantsRepository {
+public interface RushParticipantsRepository extends JpaRepository<RushParticipants, String> {
+    @Query("SELECT CASE WHEN COUNT(rp) > 0 THEN TRUE ELSE FALSE END " +
+            "FROM RushParticipants rp " +
+            "WHERE rp.rushEvent.rushEventId = :eventId AND rp.id = :userId")
+    boolean existsByRushEventIdAndUserId(@Param("eventId") Long eventId, @Param("userId") String userId);
 }